Basic notes: It only needs to be attached to one chart to function. Ideally attach to the same currency pair as the one you trade on. If trading on multiple pairs, attach it to the one with the most frequent ticks.

Advanced notes: I’ve played around in the past with a constant regular refresh, i.e. regardless of whether ticks come in or not, the code still runs a pass every X milliseconds; however, too low a resolution and the EA will not capture a fast market properly, too high and it sucks memory and is redundant for quiet markets. Hence, I’ve not opted for it.